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Source-backed error-code guide

Reviewed

Bosch Dishwasher E02 / E03 / E0103 Error Code

Bosch identifies E02, E03, and E0103 as main-control-board relay fault/error conditions and directs a single 30-second breaker reset followed by support if the code remains.

Applies to Bosch dishwasher whose exact model documentation uses the listed display

What the appliance detected

Detected condition

The dishwasher reports a main control board relay fault or error.

What may contribute

Possible causes

  • The control system detected a relay or control-board fault condition.
  • An internal board, relay, connection, or wiring condition may require professional diagnosis.

Start conservatively

Safe preliminary checks

Work in order and stop whenever a step is not supported by the documentation for your model.

  1. Record the exact display and model

    • Photograph the display before clearing E02 / E03 / E0103 and confirm every character.
    • Confirm the full Bosch E-Nr / model number because codes and supported reset procedures can vary by series.

  2. Use only the Bosch-documented reset and exterior checks

    • If the appliance and breaker can be handled safely, switch the dishwasher circuit off for 30 seconds and restore power once, as Bosch directs for this code family.
    • Avoid repeatedly power-cycling the dishwasher if the relay code returns.

  3. Stop at the service boundary

    • If the code remains or returns after the documented check, contact Bosch Customer Support or qualified appliance service.
    • Do not pull the dishwasher apart to reach pumps, heaters, control boards, sensors, wiring, or other internal components.

Actions not recommended

  • Do not test live voltage, remove electrical covers, or access the control board.
  • Do not bypass door, leak, heater, or other safety controls.
  • Do not replace a pump, heater, sensor, dispenser, wiring harness, or control board from the code alone.

When to stop and request service

  • E02, E03, or E0103 remains or returns after the documented reset.
  • The dishwasher will not start, heat, circulate, drain, or complete a cycle normally.
  • Any control-board, relay, connector, or wiring diagnosis is required.

Documented source

Official information reviewed

Our summary is based on manufacturer support material and stays within the limits of that material.

Source reviewed by Appliance Help HQ: September 22, 2026.

Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by Bosch.

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